<!DOCTYPE html>
<html>
<head>
   <meta charset="UTF-8">
  <title>Download Form</title>
  <style>
    html, body {
      height: 100%;
    }
    body {
      display: flex;
      justify-content: center;
      align-items: center;
    }
    form {
      width: 250px;
      text-align: center;
    }
  </style>
</head>
<body>
  <form action="/download" method="get">
    <button type="submit">下载</button>
  </form>
</body>
</html>
